Results 61 to 70 of about 17,011 (264)

A Reassessment of Petrochemistry of ~1.2 Ga Tonalitic Rocks of the Northern Tugela Terrane, Natal Metamorphic Belt, South Africa: Further Constraints on the Evolution of This Belt

Geological Journal, EarlyView.
Our petrochemical studies on ~1.2 Ga granitoids of the Natal Metamorphic Belt, South Africa, do not suggest any property similar to Phanerozoic‐style subduction‐related granitoids. Plot of Kotongweni Tonalite in Y versus Sr diagram (after Moyen 2011), note that most samples have Sr/Y < 50.
Palesa Leuta, Saumitra Misra, Thembiso O. Basupi   +2 more
wiley   +1 more source

δ³⁴S and Geochemical Analyses for the Determination of, and Discrimination between, Salt Samples of Different Geographic Origin: A Feasibility Study. [PDF]

Foods, 2023
Horacek M.
europepmc   +1 more source

Local Structures of Se and Br in Cretaceous–Paleogene Boundary Sediments and Concentration Effects of Ferrihydrite Originating From Impact Ejecta

Geological Journal, EarlyView.
Chemical states of Se and Br atoms in the KPg boundary sediments from Stevns Klint were studied using XAFS spectroscopy. The high concentrations of Se4+ could become an index of the degree to which the global environment was soiled with dust and ash derived from impact ejecta or volcanic eruptions.
Kei‐ichiro Murai, Akira Yoshiasa, Ginga Kitahara, Makoto Tokuda, Satoko Ishimaru, Toshihiro Moriga   +5 more
wiley   +1 more source

Petrographic and geochemical analyses to characterise the source of built historical natural stones - a case study of the volcanic stones from historical quarries and Baoguosi Temple in the city of Ningbo, China. [PDF]

Built Herit, 2023
Guo X, Zhang Y, Xu X, Dai S.
europepmc   +1 more source

Apatite in Carbonatite Preserving Primary Magmatic, Post‐Magmatic Overgrowth, and Post India‐Asia Collision‐Related Hydrothermal Alteration: Evidenced From U–Pb Isotope and Trace Element Geochemistry

Geological Journal, EarlyView.
U–Pb isotope and trace element geochemistry of apatite from carbonatites of Peshawar Plain Alkaline Igneous Province, western Himalaya shows Permo‐Carboniferous magmatism, an additional magmatic pulse during Cretaceous, and post‐magmatic hydrothermal/metasomatism during Oligocene. ABSTRACT U–Pb isotope and trace element geochemistry of apatite combined
Mehboob ur Rashid, Hafiz U. Rehman, Hao‐Yang Lee, Sun‐Lin Chung, Kaushik Das, Kazumasa Aoki, Muhammad Jawad Zeb, Nasir Ahmad, Muhammad Hussain, Hiroshi Yamamoto   +9 more
wiley   +1 more source

Evaluation of Geogenic Enrichment Using Satellite, Geochemical, and Aeromagnetic Data in the Central Anti-Atlas (Morocco): Implications for Soil Enrichment

Earth
Natural geogenic effects lead to alterations in soil heavy metal concentrations. This study assesses the presence of elevated trace-element concentrations in the Oued Irriri watershed in southeastern Morocco.
Mouna Id-Belqas, Said Boutaleb, Fatima Zahra Echogdali, Mustapha Ikirri, Hasna El Ayady, Mohamed Abioui   +5 more
doaj   +1 more source

Water-Rock Interaction and the Hydrogeochemistry of Chromium in Groundwater from Multilevels Monitoring Wells in Urania, SP, Brazil [PDF]

Geologia USP. Série Científica, 2009
Anomalous natural concentrations of chromium, sometimes exceeding the potability limit (0.05 mg.L-1), have been detectedin the groundwater of Adamantina Aquifer in the municipality of Urânia, and in a wide region of the western part ofthe State of São ...
Reginaldo Antonio Bertolo, Leonardo Nobuo Oshima Marcolan, Christine Laure Marie Bourotte   +2 more
doaj  

Iron-based microbial ecosystem on and below the seafloor: a case study of hydrothermal fields of the Southern Mariana Trough

Frontiers in Microbiology, 2012
Microbial community structures in deep-sea hydrothermal vents fields are constrained by available energy yields provided by inorganic redox reactions, which are in turn controlled by chemical composition of hydrothermal fluids.
Shingo eKato, Shingo eKato, Kentaro eNakamura, Tomohiro eToki, Jun-ichiro eIshibashi, Urumu eTsunogai, Akinori eHirota, Moriya eOhkuma, Akihiko eYamagishi   +8 more
doaj   +1 more source

Heterogeneous Exhumation Mechanisms in Neoproterozoic Collisional Metamorphism: P–T Constraints From Pelotas and Punta del Este Terranes, Southern Brazil and Uruguay

Geological Journal, EarlyView.
Petrography, thermobarometry, and pseudosection modelling reveal peak metamorphic conditions of 3–7.5 kbar and 520°C–800°C in Tonian‐Cryogenian orthogneisses of the Dom Feliciano Belt. Metamorphic field gradients of 27°C/km–39°C/km and variable exhumation mechanisms support correlation of these units as remnants of a Himalayan‐type Piratini Orogeny ...
Thaiane Niederauer‐Santos, Carla Cristine Porcher, Daniel Triboli Vieira, Edinei Koester, Diego Jaldín, Karina Luengo, Luisa Caon   +6 more
wiley   +1 more source

CONTRIBUTION TO THE GEOLOGICAL AND PETROLEUM STUDY OF THE WEST-CONGOLIAN BASIN – CASE OF CARBONATES IN THE KITOBOLA REGION IN CENTRAL CONGO, D.R. CONGO [PDF]

Romanian Journal of Petroleum & Gas Technology
Previous studies carried out in the West-Congolian basin have highlighted potential formations that could play a major role in a petroleum system. In order to complete and enrich the geological and petroleum dossier of the said basin, a field trip to the
Ravely Nsieto Lusakueno, Saint Bob Nsasa Bazona, César Tambashie Okitafumba, Gardiner Samba Vanga, Grace Tshimanga Kamba, Anselme Mavambou Mbadou   +5 more
doaj   +1 more source